javascript-notes.js

All javascript notes:

1. this article is awesome. it is about two types of variables in javascript: 
    - primitive variables
    - reference variables
    
link: https://www.javascripttutorial.net/javascript-primitive-vs-reference-values/

Summary
Javascript has two types of values: primitive values and reference values.
You can add, change, or delete properties to a reference value, whereas you cannot do it with a primitive value.
Copying a primitive value from one variable to another creates a separate value copy. It means that changing the value in one variable does not affect the other.
Copying a reference from one variable to another creates a reference so that two variables refer to the same object. This means that changing the object via one variable reflects in another variable.
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  2. which one is primitive and which is reference:

    Primitive Values
    number
    string
    boolean
    undefined
    null
    symbol


    Reference Values
    anything that is "typeof" "object"
    objects
    arrays
    functions
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